Salary
$160k – $235k per year
Location
In office (McLean)
Employment
Full-Time
First seen by Alion on Sep 2, 2026.
Overview
Company
Impact
Profile match
Cornerstone Defense LLC is a Small Business servicing the Intelligence, Defense, and Space communities of the U.S. Government. Our high-end engineers bring agile and differentiated solutions to the war fighter and mission partners.
Security clearance: Public Trust
Network EngineerMcLean, VA
Salary Range: $160-235k
The on-site Network Engineer shall perform the following minimum duties:
- Assisting the System Administrators as assigned by the Lead System Administrator.
- Assisting the Lead Network Engineer in developing and implementing IT/network plans
- Managing network operations using simple network management protocol (SNMP) network management tools.
- Diagnosing and troubleshooting network problems with network protocol capture/decode analyzers.
- Planning and building network from open system interconnect (OSI) Layer 1 through Layer 3.
- Managing TCP/IP internetworking connectivity to include addressing and subnetting.
- Monitoring network as defined in the network monitoring plan.
- Installing, configuring, updating and documenting the physical cable plant.
- Installing, configuring and managing networking hardware (switches, bridges, hubs, concentrators, transceivers).
- Installing, configuring and managing network security (firewalls, IP blocking).
- Configuring and managing virtual private networks (VPNs)
- Bachelor's degree in computer science, information systems, engineering, mathematics or four (4) years equivalent experience as network engineer or network technician.
- Six (6) years' experience with Cisco Catalyst switches and other Cisco network hardware.
- Seven (7) year intelligence community experience as a network engineer or network administrator.
- 3-5 years of HAND-ON network engineering experience in customer environment
- Hands-on Cisco firewall experience (ASA/Firepower 5510, 5515X, FP4100's, etc...)
- Hands-on Cisco Catalyst switch experience (Nexus switch experience would be a HUGE plus)
- CCNP-level knowledge of Cisco networking (No requirement for certification, but understanding at this level is required)
- Familiarity with cabling types/standards (i.e., Single Mode vs. Multi Mode, LC connector vs. SC connector, Cat5/6/7, etc...)
- Good understanding of network link virtualization technologies (i.e., Ether-channel/Port-channel, Nexus virtual port-channels (vpcs))
- Willingness to perform layer 1 tasks as needed (pulling cable, racking/stacking, etc...)
- Strong troubleshooting skills
- Strong project management experience (i.e., ability to manage projects through their full lifecycle in order to meet deadlines)
- Ability to use MS Visio to produce network diagrams
- Must be able to survive and thrive in a non-enterprise, fast paced environment
- Ability to create and present presentations and other ad-hoc technical briefings as necessary
- Understanding of how mission enclaves communicate with Enterprise networks
- Familiarity with Cisco Firewall Management Center to manage Firepower firewall
- Experience with Cisco Nexus Ethernet switching platforms (Nexus 5500, 5600, 7700, and 9500)
- Experience with Cisco MDS Fibre Channel switching platforms (MDS 9000)
- Familiarity with Storage Area Networking (SAN) and Fibre Channel protocols and standards
- Familiarity with Linux operating system
- Familiarity with SolarWinds network management/monitoring tool
- Familiarity with virtual appliances (switches, firewalls, etc...)
- Familiarity with JIRA
- Experience working in a 'mission-like' environment (outside of Enterprise comms)
- AWS/Cloud familiarity
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